DIATONE M-A05
¥ 38,000 (around 1978)
Commentary
This is a stereo power amplifier that inherits M-A01 technology.
A 2-stage differential amplifier, a current mirror drive, and a direct-coupled pure complimentary service OCL circuit are used for all stages. A highly reliable NPN/PNP silicon transistor with excellent pair characteristics is used for the final stage.
In addition, twin transistors with excellent pair characteristics are used for the first stage differential, and the pre-driver stage is a differential amplification configuration with a current mirror circuit assembled, thereby improving the DC stability of the circuit and achieving high gain.
A peak level indicator with 5 LEDs per channel is provided.
The indicator circuit logarithmically compresses the input signal, and the detection and detection signal are peak-held for approximately 0.1 second. The level is detected by the comparator, and the LED lights up corresponding to each level.
In addition, the x0. 01 range selector switch is provided so that accurate level can be read even at low volume.
Built-in protection circuit that combines electronic circuit and relay.
When a DC potential higher than a certain level is generated at the output terminal of the power amplifier, this protection circuit operates. This separates the output of the amplifier from the speaker and protects the speaker from damage.
It is also designed to work as a muting circuit that prevents unpleasant clicks that occur when the power is turned on and off.
Model Rating
| Type | Stereo power amplifier |
| Rated output | 50W + 50W (8 Ω, 20 Hz to 20 kHz, THD0.05%) |
| Harmonic distortion factor | 0.006% (8 Ω, 1W output, 20 hz to 20 khz) |
| Cross modulation distortion factor (70Hz:7kHz=4:1) |
0.01% (8 Ω, Rated Output) 0.005% (8 Ω, 1W output) |
| Output bandwidth | 15 Hz ~ 100 kHz (THD 0.1%) |
| Frequency characteristic | 10 Hz to 100 kHz + 0 -1dB |
| Input Sensitivity / Impedance | 1V/50k Ω |
| Damping factor | 45 |
| Residual noise | 200 μ V |
| S/N | 116dB |
| Phono output level | 0.1mW/W |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 125W |
| External dimensions | Width 270x Height 140x Depth 243 mm |
| Weight | 6kg |
| Attachment | PIN-PIN code |